公开(公告)号：DE3121743A1

公开(公告)日：1982-02-11

申请号：DE3121743

申请日：1981-06-01

Applicant: HITACHI LTD

Inventor： KUMADA AKIO ,  YOKOSUKA MASARU ,  MIURA SHINSUKE ,  OCHIAI TSUTOMU

IPC: C04B35/49 ,  C04B35/491 ,  C04B35/493 ,  G02F1/00 ,  G02F1/055 ,  H01L41/187 ,  C03C3/22 ,  G02F1/03 ,  G04G13/00 ,  H01L41/18

公开(公告)号：DE3110786A1

公开(公告)日：1981-12-24

申请号：DE3110786

申请日：1981-03-19

Applicant: HITACHI LTD

Inventor： KUMADA AKIO ,  IHOCHI TAKAHIKO ,  TANAKA MASASHI ,  SUZUKI KAZUMA ,  YOKOSUKA MASARU ,  MIURA SHINSUKE ,  OCHIAI TSUTOMU

IPC: H04R17/00 ,  C04B35/49 ,  C04B35/491 ,  G04C21/02 ,  G04G13/02 ,  G09F9/30 ,  G10K9/122 ,  G10K13/00 ,  H01L41/187 ,  H03H9/17 ,  H03H9/58 ,  G04C21/00 ,  G04G13/00 ,  H01L41/18 ,  C04B35/48

Abstract: Disclosed is a transparent piezoelectric transducer comprising, at least, a transparent vibrator and at least one plate of a piezoelectric ceramic material sandwiched between a pair of transparent electrodes, said transparent vibrator being disposed so as to be vibrated by the piezoelectric ceramic material plate, said piezoelectric ceramic material being a ceramic material which is represented by a formula: Pb1-xLax(ZryTiz)1-x/403 where x and y/z are set within a region enclosed with lines successively coupling points a-b-c-d-e-a in a phase diagram (FIG. 2 of the accompanying drawings) in which a ratio (y/z) between PbZrO3 and PbTiO3 is taken on an axis of abscissas, while an La concentration (x) is taken on an axis of ordinates (where x=8.4 and y/z=65/35 at a, x=6 and y/z=55.5/44.5 at b, x=6 and y/z=50/50 at c, x=12 and y/z=50/50 at d, and x=9 and y/z=65/35 at e). The transparent transducer is excellent in both the transparency and the electroacoustic response.